So, how do you usually code?
You have a task: add this thing to that place. First thing you do – you find where “that place” is and how to get “this thing”. To do it, you read the code.
Reading happens every time you need to do something, doesn’t it? If something doesn’t work, or you need to optimize it, or add one more tiny thing, you search for the place in the code and read it again. And again.